Chapter 11 is missing instruction to install redux-immutable

Created by: ralphwillgoss

Bug Chapter 11

In Chapter 10 there's an Option to install yarn add redux-immutable If you do not do this, in Chapter 11 when you run the first test it complains about the library missing.

Add to Chapter 11 a reminder to do yarn add redux-immutable if you didn't before.

mentioned in merge request !112 (closed)

Created by: ralphwillgoss

Thanks Ash

closed